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  <title>underscore_keys! (Ankoder::CoreExtension::HashExtension)</title>
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  <pre><span class="ruby-comment cmt"># File lib/ankoder/ext.rb, line 14</span>
      <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">underscore_keys!</span>
        <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">keys</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword kw">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">k</span><span class="ruby-operator">|</span>
          <span class="ruby-keyword kw">self</span>[<span class="ruby-identifier">k</span>] = <span class="ruby-keyword kw">self</span>[<span class="ruby-identifier">k</span>].<span class="ruby-identifier">underscore_keys!</span> <span class="ruby-keyword kw">if</span> <span class="ruby-keyword kw">self</span>[<span class="ruby-identifier">k</span>].<span class="ruby-identifier">is_a?</span>(<span class="ruby-constant">Hash</span>)
          <span class="ruby-keyword kw">self</span>[<span class="ruby-identifier">k</span>.<span class="ruby-identifier">to_s</span>.<span class="ruby-identifier">gsub</span>(<span class="ruby-value str">&quot;-&quot;</span>, <span class="ruby-value str">&quot;_&quot;</span>)] = <span class="ruby-keyword kw">self</span>[<span class="ruby-identifier">k</span>]
          <span class="ruby-identifier">delete</span>(<span class="ruby-identifier">k</span>) <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">k</span>.<span class="ruby-identifier">to_s</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/-/</span>
        <span class="ruby-keyword kw">end</span>
        <span class="ruby-keyword kw">self</span>
      <span class="ruby-keyword kw">end</span></pre>
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